There have been a lot of users reporting about the Steemit.com website running slow, and actions not getting reported to the blockchain.
Symptoms include:
The dev team is aware of the issue and is looking into it (GitHub issue 1818).
This way, if your post/comment is lost, you will have it saved somewhere and will not have lost all your work.
Also, check to see if your actions (such as posts/comments, upvotes, transfers, etc.) are recorded. To check the blockchain to see if an action was received, wait for around 30 seconds and then refresh the website and see if it is still there. You can also go to https://steemd.com/@youraccountname. If the action is not recorded there, it will need to be re-submitted.
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